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Investments - Gross Unrealized Losses for Fixed Maturities (Details) $ in Millions | Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security
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Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | $ 11,600.7 | $ 6,667.6
Fixed maturities, Less than twelve months, Gross unrealized losses | 273.4 | 180.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 34,766.6 | 41,511.0
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 6,201.8 | 5,692.9
Fixed maturities, Total, Fair value | 46,367.3 | 48,178.6
Fixed maturities, Total, Gross unrealized losses | 6,475.2 | 5,872.9
U.S. government and agencies |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 909.1 | 316.4
Fixed maturities, Less than twelve months, Gross unrealized losses | 17.4 | 3.1
Fixed maturities, Greater than or equal to twelve months, Fair value | 810.6 | 997.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 283.1 | 232.6
Fixed maturities, Total, Fair value | 1,719.7 | 1,313.5
Fixed maturities, Total, Gross unrealized losses | 300.5 | 235.7
Non-U.S. governments |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 32.9 | 41.9
Fixed maturities, Less than twelve months, Gross unrealized losses | 1.3 | 1.7
Fixed maturities, Greater than or equal to twelve months, Fair value | 308.8 | 331.3
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 83.2 | 57.9
Fixed maturities, Total, Fair value | 341.7 | 373.2
Fixed maturities, Total, Gross unrealized losses | 84.5 | 59.6
States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 743.2 | 596.6
Fixed maturities, Less than twelve months, Gross unrealized losses | 26.0 | 19.0
Fixed maturities, Greater than or equal to twelve months, Fair value | 4,745.7 | 5,075.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 1,115.8 | 914.8
Fixed maturities, Total, Fair value | 5,488.9 | 5,671.7
Fixed maturities, Total, Gross unrealized losses | 1,141.8 | 933.8
Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 4,970.7 | 3,210.1
Fixed maturities, Less than twelve months, Gross unrealized losses | 164.2 | 126.9
Fixed maturities, Greater than or equal to twelve months, Fair value | 20,099.1 | 22,929.1
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 3,532.3 | 3,064.4
Fixed maturities, Total, Fair value | 25,069.8 | 26,139.2
Fixed maturities, Total, Gross unrealized losses | 3,696.5 | 3,191.3
Residential mortgage-backed pass-through securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,938.4 | 633.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 33.2 | 4.9
Fixed maturities, Greater than or equal to twelve months, Fair value | 1,214.0 | 1,275.6
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 182.6 | 159.7
Fixed maturities, Total, Fair value | 3,152.4 | 1,908.6
Fixed maturities, Total, Gross unrealized losses | 215.8 | 164.6
Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 691.7 | 280.3
Fixed maturities, Less than twelve months, Gross unrealized losses | 8.2 | 4.1
Fixed maturities, Greater than or equal to twelve months, Fair value | 3,860.1 | 4,192.4
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 442.6 | 650.1
Fixed maturities, Total, Fair value | 4,551.8 | 4,472.7
Fixed maturities, Total, Gross unrealized losses | 450.8 | 654.2
Collateralized debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 582.2 | 405.6
Fixed maturities, Less than twelve months, Gross unrealized losses | 1.3 | 1.8
Fixed maturities, Greater than or equal to twelve months, Fair value | 29.8 | 2,301.6
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 5.0 | 25.4
Fixed maturities, Total, Fair value | 612.0 | 2,707.2
Fixed maturities, Total, Gross unrealized losses | 6.3 | 27.2
Other debt obligations |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 1,732.5 | 1,183.7
Fixed maturities, Less than twelve months, Gross unrealized losses | 21.8 | 18.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 3,698.5 | 4,408.8
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 557.2 | 588.0
Fixed maturities, Total, Fair value | 5,431.0 | 5,592.5
Fixed maturities, Total, Gross unrealized losses | 579.0 | 606.5
Principal Life Insurance Company |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Less than twelve months, Fair value | 10,805.4 | 5,836.0
Fixed maturities, Less than twelve months, Gross unrealized losses | 252.3 | 140.5
Fixed maturities, Greater than or equal to twelve months, Fair value | 34,145.3 | 40,717.9
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | 6,121.5 | 5,576.6
Fixed maturities, Total, Fair value | 44,950.7 | 46,553.9
Fixed maturities, Total, Gross unrealized losses | $ 6,373.8 | $ 5,717.1
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure |  |
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Percent Investment Grade (as a percent) | 97.00% | 94.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Average Price (percent of carrying value to amortized cost) | 88.00% | 89.00%
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Less Than Twelve Months | security | 1,747 | 983
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Less Than Twelve Months (percent of carrying value to amortized cost) | 98.00% | 98.00%
Available-for-sale Securities in Unrealized Loss Positions, Percent Investment Grade, Less Than Twelve Months (as a percent) | 96.00% | 91.00%
Available-for-sale Securities in Unrealized Loss Position, Aggregate Losses On Investment Grade Investments, Less Than Twelve Months | $ 245.4 | $ 131.2
Available-for-sale Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Twelve Months or Longer | security | 6,219 | 7,042
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 85.00% | 88.00%
Principal Life Insurance Company | States and political subdivisions |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 1,108.0 | $ 906.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure |  |
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 81.00% | 85.00%
Principal Life Insurance Company | Corporate debt securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 3,470.0 | $ 2,968.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure |  |
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 85.00% | 88.00%
Principal Life Insurance Company | Commercial mortgage-backed securities |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 441.5 | $ 645.6
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure |  |
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 90.00% | 87.00%
Principal Life Insurance Company | Collateralized mortgage obligation security |  |
Gross Unrealized Losses for Fixed Maturities |  |
Fixed maturities, Greater than or equal to twelve months, Gross unrealized losses | $ 490.8 | $ 472.9
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure |  |
Available-for-sale Securities in Unrealized Loss Positions, Average Price, Twelve Months or Longer (percent of carrying value to amortized cost) | 83.00% | 85.00%

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